/Engine/Source/Runtime/EngineSettings/Classes/GameMapsSettings.h
Searches the GameModeMapPrefixes list for a named game mode, if not found will return passed in string
the proper game type class path to load, or empty if not found
static [FString](API\Runtime\Core\Containers\FString) GetGameModeForMapName ( const [FString](API\Runtime\Core\Containers\FString) & MapName )